Battery pack and vehicle

ABSTRACT

A battery pack is provided. The battery pack includes a first partition piece, a battery row, and a shielding member. The first partition piece is located between two batteries adjacent to each other in a first direction in the battery row. An upper surface of the first partition piece is lower than an upper surface of a top cover. A recess is formed between the battery row and the first partition piece. The shielding member includes a first shielding portion and a second shielding portion. The first shielding portion overlays all explosion-proof valves of the battery row. A passage is disposed between the first shielding portion and the upper surface of the battery row. The passage is configured to guide a fluid to flow along the first direction and is provided with a downward opening. The second shielding portion closes off a part of the opening facing the recess directly.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.17/488,472, filed on Sep. 29, 2021, which is a continuation ofInternational Application No. PCT/CN2020/119080, filed on Sep. 29, 2020.The International Application claims priority to Chinese PatentApplication No. 201910975573.9, filed on Oct. 15, 2019. All of theafore-mentioned patent applications are hereby incorporated by referencein their entireties.

TECHNICAL FIELD

This application relates to the technical field of batteries, and inparticular, to a battery pack and a vehicle.

BACKGROUND

With the boom of new energy vehicles, the demand for power batteryproducts is increasing, and safety performance of battery products ismore important.

Thermal runaway is a major problem that threatens the safety performanceof the battery products. In a conventional battery pack, fireproofsponge usually overlays an upper part of a battery pack to temporarilyslow down heat spread during thermal runaway. This serves a shieldingfunction to some extent, but gives rise to a problem of poor airventilation. Consequently, fluids such as gas and flames generatedduring the thermal runaway are unable to be expelled in time, therebydamaging the battery pack and even causing accidents.

SUMMARY

A technical issue of this application is to enhance safety performanceof a battery pack.

To solve the technical issue, this application provides a battery pack,including:

a box body, in which a cavity is disposed;

a partition structure, disposed in the cavity and configured topartition the cavity into at least two accommodation regions, where thepartition structure includes a first partition piece;

a battery row, disposed in the accommodation regions, where the batteryrow includes a plurality of batteries arranged alongside in a firstdirection, explosion-proof valves are disposed on a top cover of thebatteries, the first partition piece is located between two batteriesadjacent to each other in the first direction in the battery row, anupper surface of the first partition piece is lower than an uppersurface of the top cover in a height direction, a recess is formedbetween the battery row and the first partition piece, and the firstdirection is perpendicular to the height direction; and

a shielding member, including a first shielding portion and a secondshielding portion, where the first shielding portion overlays all theexplosion-proof valves of the battery row, a passage is disposed betweenthe first shielding portion and the upper surface of the battery row,the passage is configured to guide a fluid to flow along the firstdirection and is provided with a downward opening, and the secondshielding portion closes off a part of the opening, the part facing therecess directly.

In some embodiments, the first shielding portion includes a body plateand two bent plates. The two bent plates are connected to two oppositeends of the body plate along a second direction respectively and areboth bent downward against the body plate. The passage is locatedbetween the body plate, the two bent plates, and the upper surface ofthe battery row. The second direction is perpendicular to the firstdirection and the height direction.

In some embodiments, a cross section of the first shielding portion isin an inverted U shape.

In some embodiments, the second shielding portion includes a base plate.The base plate closes off a part of the opening, the part facing therecess directly.

In some embodiments, the second shielding portion further includes anextension plate. The extension plate extends upward from the base plateand is connected to the first shielding portion.

In some embodiments, the second shielding portion includes two extensionplates. The two extension plates are connected to two opposite ends ofthe base plate along the second direction respectively and are both bentupward against the base plate. The two extension plates are bothconnected to the first shielding portion. The second direction isperpendicular to the first direction and the height direction.

In some embodiments, the two extension plates are connected to the twobent plates of the first shielding portion respectively.

In some embodiments, a cross section of the second shielding portion isin a U shape.

In some embodiments, the battery pack further includes a box cover. Thebox cover fits on a top of the box body. An explosion-proof exhauststructure is disposed on at least one of two opposite side plates of thebox cover, the two side plates are opposite to each other in the firstdirection. The explosion-proof exhaust structure communicates with thepassage and is configured to expel a fluid, which flows out of thepassage, out of the battery pack.

In some embodiments, the explosion-proof exhaust structure includes anexplosion-proof valve or a fragile portion. The fragile portion is apart of the side plate. A strength of the fragile portion is lower thanthat of other parts of the side plate.

In some embodiments, the battery pack further includes a box cover. Thebox cover fits on the top of the box body, and the first shieldingportion is connected to the box cover.

In some embodiments, the partition structure further includes a secondpartition piece. The second partition piece intersects the firstpartition piece. The second partition piece and the first partitionpiece jointly partition the cavity into at least two accommodationregions.

Another aspect of this application further provides a vehicle. Thevehicle includes a power source and the battery pack according to thisapplication. The power source is configured to provide power to thevehicle, and the battery pack is configured to provide electrical powerto the power source.

The second shielding portion disposed closes off a part of the downwardopening of the passage, the part facing the recess directly. Thisapplication effectively prevents a fluid generated by thermal runawayfrom flowing into the recess, more reliably achieves directionalexpulsion of the thermal runaway fluid, and enhances safety performanceof the battery pack.

BRIEF DESCRIPTION OF DRAWINGS

To describe the technical solutions in the embodiments of thisapplication more clearly, the following outlines the drawings to be usedin the description of the embodiments of this application. Apparently,the drawings outlined below are merely some embodiments of thisapplication, and a person of ordinary skill in the art may derive otherdrawings from the outlined drawings without making any creative efforts.

FIG. 1 is a schematic diagram of a three-dimensional structure of a boxbody, a partition structure, and a battery module in a battery packaccording to an embodiment of this application;

FIG. 2 is a schematic bottom view of a structure of a box cover and ashielding member in a battery pack in the embodiment shown in FIG. 1;

FIG. 3 is a top view of the structure in FIG. 2 with a first shieldingportion omitted; and

FIG. 4 is a schematic bottom view of the structure of the shieldingmember shown in FIG. 2.

REFERENCE NUMERALS

-   -   1. Box cover; 11. Top plate; 12. Side plate; 121.        Explosion-proof exhaust structure; 13. Flange;    -   2. Box body; 2 a. Cavity; 2 b. Accommodation region; 21. Bottom;        22. Lateral part; 23. Protruding portion;    -   3. Partition structure; 31. First partition piece; 32. Second        partition piece;    -   4. Battery module; 41. Battery row; 41 a. First battery row; 41        b. Second battery row; 411. Battery; 411 a. Top cover; 411 b.        Explosion-proof valve; 43. Shielding member; 431. First        shielding portion; 431 a. Body plate; 431 b. Bent plate; 432.        Second shielding portion; 432 a. Base plate; 432 b. Extension        plate; and    -   P. Passage; O. Opening; S. Recess; H. Height direction; W. First        direction; L. Second direction.

DETAILED DESCRIPTION OF EMBODIMENTS

The following clearly and fully describes the technical solutions in theembodiments of this application with reference to the drawings hereof.Apparently, the described embodiments are merely a part of but not allof the embodiments of this application. The following description of atleast one exemplary embodiment is merely illustrative, and is in no wayintended as a limitation on this application or the use thereof. Allother embodiments derived by a person of ordinary skill in the art basedon the embodiments of this application without making any creativeefforts fall within the protection scope of this application.

The technologies, methods, and devices known to a person of ordinaryskill in the related art may be described without going into details,but as appropriate, such technologies, methods, and device are regardedas a part of the granted specification.

Understandably, in the context of this application, the terms such as“first” and “second” used to qualify parts are merely intended for easeof distinguishing the parts. Unless otherwise specified, no specialmeaning is ascribed to such terms. Therefore, the terms are not to beunderstood as a limitation on the protection scope of this application.

In addition, the technical features mentioned in different embodimentsof this application described below may be combined with each other solong as they do not conflict with each other.

FIG. 1 to FIG. 4 show a battery pack according to an embodiment of thisapplication. In the illustrated embodiment, the battery pack is used asa power device of a vehicle, and is disposed on a vehicle body toprovide electric power to the vehicle. In some embodiments, the vehiclemay include: a power source that provides power to the vehicle; and abattery pack according to some embodiments. The battery pack isconfigured to provide power to the power source so as to provideelectrical power to the vehicle. The vehicle may include an electricvehicle or a hybrid vehicle or the like. The electric vehicle may use anelectric engine as a power source, where the electric engine is poweredby electrical energy output from the battery pack. The electric vehiclemay provide electrical power to the electric engine by using a batterypack according to some embodiments, may use the battery pack as anactive power source and/or a standby power source. The hybrid powervehicle may provide power by using two or more types of power sourcessuch as an internal combustion engine and an electric motor.

For clear description of directions and positions hereinafter, acoordinate system in FIG. 1 defines the directions of the battery pack.A coordinate axis H represents a height direction of the battery pack,and is also a height direction of an accommodation box and a battery 411in the accommodation box. The coordinate axis W is perpendicular to thecoordinate axis H, and is referred to as a first direction, andrepresents a width direction of the battery pack. The coordinate axis Lis perpendicular to the coordinate axis H and the coordinate axis W, andis referred to as a second direction, and represents a length directionof the battery pack.

Based on the foregoing definitions of directions, all the terms used inthe following description to indicate a direction or a positionrelationship, such as “up”, “down”, “top”, and “bottom”, are used withreference to the height direction H. A box cover 1 and a box body 2 ofthe battery pack are arranged relative to each other in the heightdirection H. A direction from the box body 2 to the box cover 1 is anupward direction, and a direction from the box cover 1 to the box body 2is a downward direction.

However, understandably, such definitions of directions and positionsare merely intended for ease or brevity of description of thisapplication. Unless otherwise specified to the contrary, suchdirectional terms do not indicate or imply that the indicated device orcomponent is necessarily in the specified direction or necessarilyconstructed or operated in the specified direction. Therefore, suchterms are not to be understood as a limitation on the protection scopeof this application.

As shown in FIG. 1 to FIG. 4, the battery pack according to thisembodiment includes an accommodation box, a battery module 4, and thelike.

The accommodation box is configured to accommodate a battery module 4and the like, and provide protection for the battery module 4 inside. Asshown in FIG. 1 and FIG. 2, in this embodiment, the accommodation boxincludes a box body 2 and a box cover 1. A cavity 2 a is disposed in thebox body 2 configured to accommodate the battery module 4 and the like.The cavity 2 a is open on the top, so as to facilitate mounting andremoval of the battery module 4. The box cover 1 fits on the top of thebox body 2 to close off the cavity 2 a. The box cover 1 may hermeticallyfit the box body 2. For example, a sealing element such as a sealingring may be disposed between the box cover 1 and the box body 2.

As can be seen from FIG. 1, the box body 2 includes a bottom 21, alateral part 22, and a protruding portion 23. The lateral part 22 andthe bottom 21 together define the cavity 2 a. The lateral part 22 isconnected a circumference of the bottom 21 and extends upward. Theprotruding portion 23 is connected to one end of the lateral part 22 andextends outward in a second direction L. Specifically, the lateral part22 and the bottom 21 define a hollow cuboidal shape. The inner cuboidalcavity 2 a is configured to accommodate the battery module 4. Theprotruding portion 23 is trapezoidal, on which electronic components maybe disposed to control working modes such as charging mode anddischarging mode of the battery module 4.

As can be seen from FIG. 2, an overall shape of the box cover 1 adaptsto the box body 2, and includes a rectangular portion and a trapezoidalpart. The rectangular portion includes a top plate 11 and a side plate12 that is connected to a circumference of the top plate 11 and thatextends downward. The trapezoidal portion is connected to one end of theside plate 12, and extends outward in the second direction L to form aflange 13.

When the box cover 1 fits snugly on the box body 2, the side plate 12 ofthe box cover 1 fits the lateral part 22 of the box body 2, and a flange13 of the box cover 1 fits the protruding portion 23 of the box body 2to close off the cavity 2 a.

When the accommodation box is disposed on a vehicle body, the box cover1 faces upward, and a side where the protruding portion 23 and theflange 13 are located is disposed near the front of the vehicle. To bespecific, when the battery pack is mounted on the vehicle, the heightdirection H is along a height direction of the vehicle body, and thesecond direction L is along a length direction of the vehicle body and aheadway direction of the vehicle.

Disposed in the cavity 2 a, the battery module 4 is a core component ofthe battery pack and is configured to provide electrical energy to thevehicle. As shown in FIG. 1 and FIG. 3, in this embodiment, the batterymodule 4 includes 6 battery rows 41. The 6 battery rows 41 are arrangedalongside in the second direction L.

In order to simplify the structure, structures of all battery rows 41 inthis embodiment are identical. Therefore, the following describes thestructure of merely one of the battery rows 41.

As shown in FIG. 3, the battery row 41 includes a plurality of batteries411. Each battery 411 includes a top cover 411 a and an explosion-proofvalve 411 b disposed on the top cover 411 a. When the battery 411 isthermally runaway, the explosion-proof valve 411 b may be burst open bygas, heat, flames and other high-temperature and high-pressure fluids(collectively referred to as gas) generated inside the battery 411. Inthis way, the gas is expelled out of the battery 411, and the pressureinside the battery 411 is released from the top cover 411 a.

All the batteries 411 in the battery row 41 are arranged alongside andface an identical direction. In FIG. 1 and FIG. 3, all the batteries 411in the battery row 41 are arranged vertically. The height direction H ofthe battery row is along a vertical direction, and is consistent withthe height direction of the box body 11. All the top covers 411 a faceupward. In other words, all the top covers 411 a are arranged toward thebox cover 1 and back from the box body 2. In addition, all the batteries411 in the battery row 41 are arranged alongside in the first directionW to form a row.

It needs to be noted that the quantity of battery rows 41 in the batterymodule 4 is not limited to 6. In fact, the battery module 4 may includeone or at least two battery rows 41. When at least two battery rows 41are included, all the battery rows 41 are arranged alongside in thesecond direction L.

As mentioned above, the battery pack according to this embodimentincludes a plurality of battery rows 41. The quantity of batteries 411in each battery row 41 is more than one. Therefore, the battery packcontains a plurality of batteries 411, and the plurality of batteries411 are arranged in rows and columns to form a battery array thatincludes a plurality of rows and columns.

To stow the plurality of batteries 411 more orderly in the battery pack,as shown in FIG. 1 and FIG. 3, the battery pack may further include apartition structure 3. The partition structure 3 is disposed in thecavity 2 a and partitions the cavity 2 a into at least two accommodationregions 2 b. The batteries 411 in the battery pack are arranged ingroups in different accommodation regions 2 b. In this way, batteries411 in each different group are accommodated in a differentaccommodation region 2 b, thereby being more orderly and making itconvenient to stow the batteries. Moreover, the batteries 411 indifferent groups can be positioned more reliably by using the partitionstructure 3.

As can be seen from FIG. 1 and FIG. 3, the partition structure 3 in thisembodiment includes a first partition piece 31. The first partitionpiece 31 extends in the second direction L, and partitions the cavity 2a into different accommodation regions 2 b arranged along the firstdirection W. In addition, the partition structure 3 further includes asecond partition piece 32. The second partition piece 32 extends in thefirst direction W, and intersects the first partition piece 31. In thisway, the second partition piece 32 further partitions the accommodationregions 2 b that are formed by partitioning by the first partition piece31. Therefore, more accommodation regions 2 b exist in the cavity 2 a.The accommodation regions 2 b not only include the accommodation regions2 b arranged along the first direction W, but also include theaccommodation regions 2 b arranged along the second direction L.

When the batteries 411 are placed in groups in the cavity 2 a, differentbattery rows 41 may be accommodated in groups in different accommodationregions 2 b arranged along the second direction L, so that the batteryrows 41 in each different group are stowed in a different region. Inaddition, the batteries 411 in the same battery row 41 are accommodatedin groups along the first direction W into different accommodationregions 2 b that are arranged along the first direction W, so that thebatteries inside the same battery row 41 are stowed in different regionsalong the first direction W.

Specifically, in the illustrated embodiment, as can be seen from FIG. 3,the partition structure 3 includes one first partition piece 31 and twosecond partition pieces 32. The two second partition pieces 32 arearranged alongside in the second direction L and are spaced apart fromeach other. The first partition piece 31 is perpendicular to both secondpartition pieces 32. In this way, under the action of the firstpartition piece 31 and the second partition piece 32, the partitionstructure 3 partitions the cavity 2 a into a total of 6 accommodationregions 2 b laid out in 2 rows and 3 columns. The 6 battery rows 41arranged alongside in the second direction L are partitioned by the 2second partition pieces 32, where the battery rows 41 are located inpairs on the same side of each of the two second partition pieces 32. Inthe first direction W, the battery rows 41 are further partitioned byone first partition piece 31. That is, the first partition piece 31 islocated between two batteries 411 adjacent along the first direction Win the battery row 41. In this way, each battery row 41 is furtherpartitioned by the first partition piece 31 into the first battery row41 a and the second battery row 41 b arranged along the first directionW. Therefore, the first battery row 41 a and the second battery row 41 bin the same battery row 41 are also in different accommodation regions 2b.

More specifically, as shown in FIG. 3, in this embodiment, the firstpartition piece 31 is located in the middle of the battery rows 41 alongthe first direction W, so that the quantity of the batteries 411 in thefirst battery row 41 a is equal to that in the second battery row 41 b.

Understandably, the quantities of the first partition pieces 31 and thesecond partition pieces 32 as well as the position of the firstpartition piece 31 are not limited to those shown in FIG. 3. Forexample, the quantity of the first partition piece 31 may be at leasttwo. For another example, the quantity of the second partition pieces 32may vary with the quantity of groups of the battery rows 41, and isusually less than the quantity of groups of the battery rows 41 by one.When the quantity of the second partition pieces 32 is at least two, thesecond partition pieces 32 are arranged alongside in the seconddirection L and are spaced apart from each other. For another example,the first partition piece 31 may be located not in the middle of thebattery row 41 in the first direction W, but near a side in the firstdirection W. In this case, the quantity of the batteries 411 in thefirst battery row 41 a is not equal to that in the second battery row 41b.

The first partition piece 31 and the second partition piece 32 may bebeam structures. In FIG. 3, the first partition piece 31 may be referredto as a longitudinal beam, and the second partition piece 32 may bereferred to as a cross beam. In addition, both the first partition piece31 and the second partition piece 32 are fixedly connected to the boxbody 2. Specifically, both the first partition piece 31 and the secondpartition piece 32 are fixedly connected to the bottom 21 of the boxbody 2.

Moreover, as can be seen from FIG. 1, in this embodiment, along theheight direction H, an upper surface of the first partition piece 31 isnot flush with an upper surface of the top cover 411 a of the battery411, but is lower than the upper surface of the top cover 411 a. In thiscase, a recess S is formed between the battery row 41 and the firstpartition piece 31. Specifically, the recess S is located between theupper surface of the top cover 411 a of the first battery row 41 a, theupper surface of the top cover 411 a of the second battery row 41 b, andthe upper surface of the first partition piece 31. The recess S mayaccommodate a signal collection wire configured to electrically connectthe batteries 411 in each accommodation region 2 b, so as to implementcollection and transmission of temperature or voltage signals of eachbattery 411.

As mentioned above, when the battery 411 is thermally runaway, thegenerated gas is expelled from the explosion-proof valve 411 b on thetop cover 411 a. If the generated gas ejected from the explosion-proofvalve 411 b is not guided, a flow direction and a spread scope of thegenerated gas are not controllable, and the gas flows in the heightdirection H, the first direction W, and the second direction L. However,when flowing upward, the gas will directly impact passengers above thebattery pack, and threaten safety of the passengers. When flowing in thesecond direction L, the gas may cause failure of other battery rows 41,and additionally, may flow to a space under the front of the vehicle toaggravate hazards to the passengers. Moreover, in this embodiment, arecess S exists between the first battery row 41 a, the second batteryrow 41 b, and the first partition piece 31. The gas may further flowdownward into the recess S to burn out the signal collection wire in therecess S, and even to cause secondary hazards such as a short circuit.

Therefore, to protect the battery pack and the passengers against thegas ejected by the explosion-proof valve 411 b, the battery packaccording to this embodiment further includes a shielding member 43. Theshielding member 43 is configured to directionally guide the gasreleased by the explosion-proof valve 411 b, and guide the gas from theanti-explosion valve 411 b to stop being expelled upward, downward, oralong the second direction L. Instead, the gas is guided to be expelledmainly along the first direction W, thereby reducing risks of thermalrunaway, improving safety performance of the battery pack, and enhancingthe safety of the passengers.

The quantity of the shielding members 43 is identical to the quantity ofthe battery rows 41, and are arranged above the battery rows 41 inone-to-one correspondence to the battery rows 41. Specifically, as shownin FIG. 1, corresponding to the 6 battery rows 41, the quantity of theshielding members 43 is also 6, and the shielding members 43 arearranged in one-to-one correspondence with the battery rows 41. In thisway, by means of each shielding member 43, the gas released by theexplosion-proof valve 411 b of the corresponding battery row 41 can beguided to be expelled along the first direction W.

In this embodiment, structures of all the shielding members 43 areidentical, and each include a first shielding portion 431 and a secondshielding portion 432. The first shielding portion 431 overlays all theexplosion-proof valves 411 b in the battery row 41. A passage P isdisposed between the first shielding portion 431 and the upper surfaceof the top cover 411 a. The passage P is configured to guide the gas toflow along the first direction W, and is provided with a downwardopening O. The second shielding portion 432 closes off a part of theopening O, the part facing the recess S directly.

The first shielding portion 431 can prevent the gas of the battery row41 from flowing upward or along the second direction L. In addition, thesecond shielding portion 432 is disposed to close off the part of thedownward opening O of the passage P, the part facing the recess Sdirectly, so that the gas from the explosion-proof valve 411 b stopsflowing down into the recess S. Therefore, the shielding member 43according to this embodiment prevents the gas from spreading to regionsoutside the passage P, more reliably guides the gas to flow along thefirst direction W in the passage P, improves the safety of the batterypack in use, prevents the gas from directly impacting the passengersabove, and enhances the safety of the vehicle.

In addition, the second shielding portion 432 is disposed to close offthe part of the downward opening O of the passage P, the part facing therecess S directly, so that the gas from the explosion-proof valve 411 bis prevented from flowing into recess S. This prevents the gas fromburning out the signal collection wire in the recess S or flowing toother regions, effectively reduces the secondary hazards such as ashort-circuit, and further enhances the safety performance of thebattery pack.

Specifically, as shown in FIG. 4, the first shielding portion 431includes a body plate 431 a and two bent plates 431 b. The body plate431 a extends along the first direction W. That is, the body plate 431 aextends along an arrangement direction of the batteries 411 in thebattery row 41. The two bent plates 431 b are connected to two oppositeends of the body plate 431 a along the second direction L respectively,and are both bent downward against the body plate 431 a (that is, towarda direction near the battery row 41). Based on this, the two bent plates431 b support the body plate 431 a above the battery row 41. A passage Pextending along the first direction W is formed between the body plate431 a, the two bent plates 431 b, and the upper surface of the top cover411 a of the battery row 41. The top of the passage P and two sidesalong the second direction L are closed off. Although a downward openingO exists at a lower part of the passage P, a majority of the opening Ois also closed off by the upper surface of the top cover 411 a of thebattery row 41. Merely the two ends along the first direction W and apart of the opening O are open, the part facing the recess S directly.

The second shielding portion 432 includes a base plate 432 a. The baseplate 432 a closes off a part of the opening O, the part facing therecess S directly. In this way, the part of the opening O, which facesthe recess S directly, is not open, and the gas from the explosion-proofvalve 411 b is unable to enter the recess S to damage the signalcollection wire in the recess S or to flow to other regions, therebyeffectively avoiding secondary hazards such as a short circuit. Inaddition, the body plate 431 a and the bent plates 431 b of the firstshielding portion 431 serves to close off the top of the passage P andthe two sides along the second direction L. Therefore, the passage P isopen merely at the two ends along the first direction W. In this way,under the joint action of the first shielding portion 431 and the secondshielding portion 432, the gas bursting from the explosion-proof valve411 b of the battery 411 is unable to flow upward or flow out along thesecond direction L, and is unable to flow into the recess S, but canflow out along the first direction W. In a case of mounting in thevehicle body, the first direction W is along the width direction of thevehicle body, not the headway direction or the upward direction wherethe passengers are located. Therefore, with the gas being guided to beexpelled in the width direction of the vehicle body, the gas can beexpelled safely, and the safety threat of the gas to the passengers isreduced.

To fix the base plate 432 a, the base plate 432 a may be directlyconnected to the first shielding portion 431. For example, the baseplate 432 a may be directly connected to the two bent plates 431 a.Alternatively, the second shielding portion 432 may further include anextension plate 432 b. The extension plate 432 b extends upward from thebase plate 432 a, and is connected to the first shielding portion 431,so that the base plate 432 a can be connected to the first shieldingportion 431 through the extension plate 432 b. In an implementationmanner, the second shielding portion 432 may include two extensionplates 432 b. The two extension plates 432 b are connected to twoopposite ends of the base plate 432 a along the second direction Lrespectively, and are both bent upward against the base plate 432 a. Inaddition, the two extension plates 432 b are both connected to the firstshielding portion 431. For example, the two extension plates 432 a maybe connected to the two bent plates 431 b of the first shielding portion431 respectively to fix the base plate 432 a more steadily.

Specifically in FIG. 4, the two extension plates 432 b are both locatedin the passage P, and are connected to the corresponding bent plates 431b respectively. In this way, the base plate 432 a can be connected toinner lateral surfaces of the two bent plates 431 b through the twoextension plates 432 b. Alternatively, at least one of the two extensionplates 432 b may be located outside the passage P.

The body plate 431 a and the bent plates 431 b may be any of variousplate structures such as a flat plate, a curved plate, or aspecial-shaped plate. A cross section of the first shielding portion 431(that is, a section perpendicular to the first direction W) may be inany of various shapes such as an inverted U shape or an M shape. Forexample, in FIG. 3, the cross section of the first shielding portion 431is in an inverted U shape. Compared with other shapes, the inverted Ushape simplifies the structure of the first shielding portion 431 andfacilitates processing.

The base plate 432 a and the extension plate 432 b may also be any ofvarious plate structures such as a flat plate, a curved plate, or aspecial-shaped plate. A cross section of the second shielding portion432 (that is, the section perpendicular to the first direction W) may bein any of various shapes such as a U shape or a W shape. For example, inFIG. 4, the cross section of the second shielding portion 432 is in a Ushape. Compared with other shapes, the U shape simplifies the structureof the second shielding portion 432 and facilitates processing.Moreover, the U shape facilitates connecting to the inverted-U-shapedfirst shielding portion 431, helps to fix the second shielding portion432 more steadily, and helps to close off a part of the opening O moreairtightly, the part facing the recess S directly.

To limit the position of the shielding member 43 conveniently, theshielding member 43 may be connected to the box cover 1, for example,may be welded to the top plate 11 through the body plate 431 a, so as toimplement the mounting and fixing of the shielding member 43 andfacilitate the shielding member 43 to more reliably overlay allexplosion-proof valves 411 b in the battery row 41. Compared with othershapes such as an M shape of the cross section of the shielding member43, the shielding member 43 with an inverted-U-shaped cross sectionfacilitates firmer welding to the top plate 11 because closer contact isimplemented between the body plate 431 a and the top plate 11 due to alarger contact area.

As can be learned from the foregoing, the second shielding portion 432is disposed on the basis of the first shielding portion 431, so that thegas bursting from inside the battery 411 can be prevented from spreadingto regions outside the passage P when the gas flows in the passage P. Inthis way, under the coordination of the first shielding portion 431 andthe second shielding portion 432, the gas can flow smoothly along thefirst direction W to the two ends in the first direction W of theaccommodation box, and can be expelled from the two ends in the firstdirection W of the accommodation box. This can more effectively exertthe directional gas guiding function of the shielding member 43 and moreeffectively implement the function of preventing heat spreading.

To further facilitate expulsion of the gas out of the accommodation box,as shown in FIG. 1, in this embodiment, an explosion-proof exhauststructure 121 is disposed on at least one of two opposite side plates 12of the box cover 1, where the two side plates are opposite to each otherin the first direction W. The explosion-proof exhaust structure 121communicates with the passage P and is configured to expel a fluid inthe passage P out of the battery pack. The explosion-proof exhauststructure 121 may include an explosion-proof valve. For example, amounting hole may be disposed on the side plate 12, and theexplosion-proof valve is mounted in the mounting hole. Alternatively,the explosion-proof exhaust structure 121 may include a fragile portion.The fragile portion is a part of the side plate 12, and a strength ofthe fragile portion is lower than that of other parts of the side plate12. For example, the fragile portion may be a groove or a notch on theside plate 12.

The explosion-proof exhaust structure 121 disposed on the side plate 12located in the first direction W enables the gas guided by the passage Pto be easily expelled through the explosion-proof exhaust structure 121.The gas can be expelled more smoothly. The explosion-proof exhauststructure 121 controls the expulsion of the gas to some extent, forexample, controls the gas in such a way that the gas is not expelleduntil the gas reaches a preset pressure, thereby helping to furtherenhance the safety of the battery pack.

In conclusion, in this application, the shielding member 43 serves todirectionally guide the gas more effectively, and more reliably guidethe gas to be directionally expelled along the desired first direction Wto the explosion-proof exhaust structure 121 located on the side plate12. In this way, the high temperature and high pressure inside thebattery 411 are released in time in a case of thermal runaway, the gasis prevented from spreading to undesired regions, the hazards of thermalrunaway are reduced, the safety of the battery pack in use is enhanced,and safety hazards to the passengers in the vehicle equipped with thebattery pack are reduced.

The foregoing descriptions are merely exemplary embodiments of thisapplication, but are not intended to limit this application. Anymodifications, equivalent substitutions, and improvements made withinthe spirit and principles of this application shall fall within theprotection scope of this application.

What is claimed is:
 1. A battery pack, comprising: a box body; a batteryrow, disposed in the box body, wherein the battery row comprises aplurality of batteries arranged alongside in a first direction,explosion-proof valves are disposed on a top cover of the batteries, arecess is formed between two batteries adjacent to each other in thefirst direction in the battery row and the first direction isperpendicular to a height direction of the plurality of batteries; and ashielding member, comprising a first shielding portion and a secondshielding portion, wherein the first shielding portion is configured tooverlay all the explosion-proof valves of the battery row, a passage isdisposed between the first shielding portion and the upper surface ofthe top cover, the passage is configured to guide a fluid to flow alongthe first direction and is provided with a downward opening, and thesecond shielding portion is configured to close off a part of theopening, the part facing the recess directly, so as to directionallyguide a gas released by the explosion-proof valve, so that the gas fromthe anti-explosion valve expelled mainly along the first direction. 2.The battery pack according to claim 1, wherein the battery pack furthercomprises a partition structure which is disposed in the cavity andconfigured to partition the cavity into at least two accommodationregions, wherein the partition structure comprises a first partitionpiece, the battery row is disposed in the partition structure, the firstpartition piece is located between the two batteries adjacent to eachother in the first direction in the battery row, an upper surface of thefirst partition piece is lower than an upper surface of the top cover inthe height direction, and the recess is formed between the battery rowand the first partition piece.
 3. The battery pack according to claim 1,wherein the first shielding portion comprises a body plate and two bentplates, the two bent plates are connected to two opposite ends of thebody plate along a second direction respectively and are both bentdownward against the body plate, the passage is located between the bodyplate, the two bent plates, and the upper surface of the top cover, andthe second direction is perpendicular to the first direction and theheight direction.
 4. The battery pack according to claim 3, wherein across section of the first shielding portion is in an inverted U shape.5. The battery pack according to claim 1, wherein the second shieldingportion comprises a base plate, and the base plate is configured toclose off a part of the opening, the part facing the recess directly. 6.The battery pack according to claim 5, wherein the second shieldingportion further comprises an extension plate, and the extension plate isconfigured to extend upward from the base plate and is connected to thefirst shielding portion.
 7. The battery pack according to claim 6,wherein the second shielding portion comprises two extension plates, thetwo extension plates are connected to two opposite ends of the baseplate along a second direction respectively and are both bent upwardagainst the base plate, the two extension plates are both connected tothe first shielding portion, and the second direction is perpendicularto the first direction and the height direction.
 8. The battery packaccording to claim 7, wherein the two extension plates are connected tothe two bent plates of the first shielding portion respectively.
 9. Thebattery pack according to claim 7, wherein a cross section of the secondshielding portion is in a U shape.
 10. The battery pack according toclaim 1, wherein the battery pack further comprises a box cover, the boxcover is configured to fit on a top of the box body, an explosion-proofexhaust structure is disposed on at least one of two opposite sideplates of the box cover, the two side plates are opposite to each otherin the first direction, and the explosion-proof exhaust structure isconfigured to communicate with the passage and is configured to expel afluid, which flows out of the passage, out of the battery pack.
 11. Thebattery pack according to claim 10, wherein the explosion-proof exhauststructure comprises an explosion-proof valve or a fragile portion, thefragile portion is a part of the side plate, and a strength of thefragile portion is lower than that of other parts of the side plate. 12.The battery pack according to claim 1, wherein the battery pack furthercomprises a box cover, the box cover is configured to fit on the top ofthe box body, and the first shielding portion is connected to the boxcover.
 13. The battery pack according to claim 2, wherein the partitionstructure further comprises a second partition piece, the secondpartition piece is configured to intersect the first partition piece,and the second partition piece and the first partition piece jointly areconfigured to partition the cavity into the at least two accommodationregions.
 14. A vehicle, comprising: a power source, wherein the powersource provides power to the vehicle; and a battery pack, wherein thebattery pack is configured to provide electrical power to the powersource, and the battery pack comprises: a box body; a battery row,disposed in the box body, wherein the battery row comprises a pluralityof batteries arranged alongside in a first direction, explosion-proofvalves are disposed on a top cover of the batteries, a recess is formedbetween two batteries adjacent to each other in the first direction inthe battery row and the first direction is perpendicular to a heightdirection of the plurality of batteries; and a shielding member,comprising a first shielding portion and a second shielding portion,wherein the first shielding portion is configured to overlay all theexplosion-proof valves of the battery row, a passage is disposed betweenthe first shielding portion and the upper surface of the top cover, thepassage is configured to guide a fluid to flow along the first directionand is provided with a downward opening, and the second shieldingportion is configured to close off a part of the opening, the partfacing the recess directly, so as to directionally guide a gas releasedby the explosion-proof valve, so that the gas from the anti-explosionvalve expelled mainly along the first direction.